Autumn in biotope. Jojkic’s Dunavac is a natural entity with a living world specific to Serbia

__st place in Biotope Aquarium Design Contest 2018

croatia Serbia. Branislav Jakovljević

Volume: 200 L
Dimensions: 100x50x40 cm
List of fishes: Alburnus alburnus, Scardinius erythrophthalmus, Rutilus rutilus, Carassius gibelio
List of plants: Ceratophyllum demersum, Salvinia natans, Bolboschoenus maritimus, Cyperus sp.
Description of decorations: The substrate is a small Danubian sand with stones of the Danube siga, the wood is an unknown species extracted from the native water, the dry leaves are extracted from the native water.
Description of equipment: undergravel filter Resun with air pump Tetra, Ligth LED Resun.
Water parameters: Temperature 16°C, pH 7.5, GH 12.

INFORMATION ABOUT BIOTOPE

Description of the area surrounding the biotope: This biotope aquarium is an original copy of the natural whole called Jojkićev Dunavac. Autumn is the time when there are lots of leaves in the water as well as a lot of underwater plants with remains of branches of leaves and other natural biological waste. The aquarium concept is: a lot of local plants, stumps and leaves with associated species of fish that live in this biotope. Appearance is authentic from water obtained by diving in this biotope.

Description of the underwater landscape of the biotope: With this cut part of nature, the shore of the Jojkic’s Danube with the original hail from this water is shown as a fish hideaway with water and semi-aquatic plants that grow in water and on the coast.

Description of the parameters of the habitat: Water is semi-transparent and the temperature ranges from 2-4 degrees over winter to 30 degrees over the summer. There is a lot of biological waste from the leaves of trees, branches and seeds of foxes of underwater plants.

List of fishes and invertebrates occurring in the nature biotope: Alburnus alburnus, Scardinius erythrophthalmus, Rutilus rutilus, Carassius gibelio, Amiurus nebulosus, Tinca tinca, Cyprinus carpio.

List of plants found in the nature biotope: Ceratophullum demersum, Salvinia natans, Bolboshoenus maritimus, Cyperus sp., Nymphaea, Nuphar.

Threats to the ecology: Jojkic’s Dunavac is a channel that supplies fishponds in the vicinity of Belgrade with water. It is also a waterway for fishing boats and ships. Ecological is very endangered and it is necessary to clean the sludge, which is more than 1 meter in some parts. The depth in the autumn period is about 1-2 m and in the spring about 4 – 5 m.

Sources of information: Web browser and personal exploration by diving and fisherman experience.

Comments of the members of the jury of Biotope Aquarium Design Contest 2018